216208385 has 8 divisors (see below), whose sum is σ = 262734720. Its totient is φ = 170776944.

The previous prime is 216208379. The next prime is 216208409. The reversal of 216208385 is 583802612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216208385 - 2¹⁴ = 216192001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273287 + ... + 274076.

It is an arithmetic number, because the mean of its divisors is an integer number (32841840).

Almost surely, 2^216208385 is an apocalyptic number.

It is an amenable number.

216208385 is a deficient number, since it is larger than the sum of its proper divisors (46526335).

216208385 is an equidigital number, since it uses as much as digits as its factorization.

216208385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547447.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 216208385 is about 14704.0261493239. The cubic root of 216208385 is about 600.1928870584.

The spelling of 216208385 in words is "two hundred sixteen million, two hundred eight thousand, three hundred eighty-five".